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Finding the Fourth Proportional to 258,603.81, 387,906.17 and 81,124.81

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Solution

The fourth proportional to 258,603.81, 387,906.17 and 81,124.81 is: 121,687.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,603.81 : 387,906.17 = 81,124.81 : x
  2. Step 2: Convert to fraction form
    258,603.81/387,906.17 = 81,124.81/x
  3. Step 3: Cross multiply
    258,603.81x = 387,906.17 × 81,124.81
  4. Step 4: Simplify right side
    258,603.81x = 31,468,812,963.69
  5. Step 5: Solve for x
    x = 31,468,812,963.69/258,603.81
  6. Step 6: Final answer
    x = 121,687.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.